Weather front
A weather front is a boundary in between two masses of air of different densities, and is the main cause of significant weather. In surface weather analyses, fronts are depicted using various colored lines and symbols. The air masses separated by a front usually differ in temperature and humidity.
Cold fronts may feature narrow bands of thunderstorms and severe weather, and may on occasion be preceded by squall lines or dry lines. Warm fronts are usually preceded by layered precipitation and fog. The weather usually quickly clears after a front passes. Some fronts produce no precipitation and little cloudiness, although there is usually a wind shift.
Weather Front Media
Approaching weather fronts are often visible from the ground, but are not always as well defined as this.
Weather map symbols:*Template:Div col begin* 1. cold front * 2. warm front * 3. stationary front * 4. occluded front * 5. surface trough * 6. squall / shear line * 7. dry line * 8. tropical wave * 9. trowal*
Occluded front depiction for the Northern Hemisphere
A shelf cloud such as this one can be a sign that a squall is imminent
- Konvektionsregen
